BVRI CCD photometry of the globular cluster M55 (NGC 6809)

Details BVRI CCD photometry of the globular cluster M55 (NGC 6809) BVRI CCD photometry of the globular cluster M55 (NGC 6809)

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..190a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 1, July 1992, p. 190-202, 431-433.

Astronomy and Astrophysics

Astronomy

17

Astronomical Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Globular Clusters, Metallicity, Astronomical Photography, Reflecting Telescopes

Scientific paper

The paper presents BVRI photometry of two neighboring fields in the globular cluster M55 (NGC 6809) observed with a CCD camera and the 2.2-m telescope at ESO/La Silla. A comparison of BV color-magnitude diagram (CMD) of the M55 with those of Lee (1977) and Schade et al. (1988) showed generally good agreement down to about a magnitude below the main-sequence turnoff, although deviations at the extreme values of color and magnitude were found. The four-color CMDs fitted to the theoretical isochrons of VandenBerg and Bell (1985) give a best age of 14.5 +/-3 Gyr.

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